Hey, this isn't a huge deal but I'm going through my logs and I found these errors:

https://pastebin.com/MUcvVxqD

I'm not sure if this is an issue with the mod itself or just with my setup. If there's a way I can fix it, please let me know? Thank you very much for your time!

• Minecraft version: 1.12.2
• Forge version: forge-1.12.2-14.23.5.2838-universal
• Modpack version (links to current modlist): 1.7.2
• Mod versions: 1.5.1

Addendum: I do have CraftTweaker scripts that edit the recipes of the Ruby and Sapphire keys to use ore dictionary entries instead of the mod-specific rubies and sapphires (which I have disabled because I already have at least one of each, haha). Could that be affecting it?

Yes, that could do it. The advancement recipe is looking for mod specific items (ruby/sapphire), but they don't exist anymore because you disabled them.

Ah, I see. Well that's a shame. Thanks for the response!